CAPTCHAs are commonly used to distinguish between human and bot users on the web. However, despite having various types of CAPTCHAs, there are still concerns about their security and usability. To address these concerns, we surveyed over 250 participants from a university campus and Amazon Mechanical Turk. Our goal was to gather user perceptions regarding the security and usability of current CAPTCHA implementations. After analyzing the data using statistical and thematic methods, we found that users struggle to navigate current CAPTCHA challenges due to increasing difficulty levels. As a result, they experience frustration, which negatively impacts their user experience. Additionally, participants expressed concerns about the reliability and security of these systems. Our findings can offer valuable insights for creating more secure and user-friendly CAPTCHA technologies.

翻译：验证码通常用于区分网络上的真实用户与机器人用户。然而，尽管存在多种类型的验证码，其安全性和可用性仍存在诸多疑虑。为探究这些问题，我们对来自大学校园和亚马逊 Mechanical Turk 平台的超过 250 名参与者进行了调查。我们的目标是收集用户对当前验证码实现方案在安全性和可用性方面的感知。通过使用统计与主题分析方法对数据进行处理，我们发现用户因验证码难度不断增加而难以应对当前的验证码挑战，从而导致挫败感，对其用户体验产生负面影响。此外，参与者对这些系统的可靠性和安全性表示担忧。我们的研究结果可为开发更安全、用户友好的验证码技术提供有价值的参考。